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I will probably drop the biners in the future just to save weight and use the through-the-loop method lVleph is talking about.

I was doing that before I got the biners. I'm using the straps from Ed Speers and I was noticing that they were beginning to get a little fuzzy around the loop in the strap. I think the biners eliminate the extra wear on the straps as well as being much quicker since you don't have to remove the strap from the rings or CC buckle to wrap it around the tree.

A stick or very small piece of pad between the biner and the tree, as mentioned earlier, is a good idea, especially on thin, tightly barked trees. It shouldn't affect a pine since the bark should be thick enough.

I was doing that before I got the biners. I'm using the straps from Ed Speers and I was noticing that they were beginning to get a little fuzzy around the loop in the strap. I think the biners eliminate the extra wear on the straps as well as being much quicker since you don't have to remove the strap from the rings or CC buckle to wrap it around the tree.

A stick or very small piece of pad between the biner and the tree, as mentioned earlier, is a good idea, especially on thin, tightly barked trees. It shouldn't affect a pine since the bark should be thick enough.

What kind of force do you think is on the biner. I would want to get a minimal (making it lighter also) type biner.

I think you're right, FF. It's a great setup, particularly in regard to ease of adjustablity. I have my SMC descending rings on order through REI as of about 20 mins ago. I bought my cordage from my local outfitter yesterday, along with some extra cord to do an adjustable ridgeline. Of all the good ideas I saw in Hot Springs, that seemed the simplest and one of the best. It also seemed easiest from a DIY standpoint. I definitely caught the DIY bug in Hot Springs, so this will be my first project of even the simplest magnitude. I'm looking forward to seeing how it goes, especially on my section hike in June. I know it seems trivial, but I'll probably post pics of it just 'cause I can.

Even though I cant sew a lick, I get to feel that DIY rush when I'm swinging in the trees.

Do the Nano biners work for suspension?
I have the Ursalite Micro Biner, but I doubt they would be enough.

Those Micro biners are indeed not meant for suspension weight, and don't come stamped with a weight rating. The CAMP Nano Wire Biners work very well for suspension as they are an actual climbing biner rated at 22kN.